fix(proxy): return no rows when the aggregated activity entity filter is empty (#37414)

The aggregated daily-activity queries build their WHERE clause as raw SQL, and
an empty entity list rendered as `"team_id" IN ()`, which Postgres rejects with
`syntax error at or near ")"`. Callers reach that state normally: a caller
without admin view and no explicit team_ids has its scope resolved to the teams
it belongs to, so anyone belonging to no teams, an org admin for instance, sent
an empty list and got a 500 back from /team/daily/activity/aggregated.

The paginated endpoint hands the same empty list to Prisma, which renders
`in: []` and matches nothing, so it kept returning 200 with an empty result set.
Emit FALSE for the empty case so the raw-SQL path lands on the same answer,
mirroring what the api_key filter a few lines below already does.

The fix covers both aggregated queries at once because they share one WHERE
clause builder.

litellm/proxy/management_endpoints/common_daily_activity.py

@@ -594,13 +594,16 @@ def _build_aggregated_where_clause(
     sql_params.append(adjusted_end)
     p += 1
 
-    # Optional entity filter
+    # Optional entity filter; an empty list must match nothing, not everything
     if entity_id is not None:
         if isinstance(entity_id, list):
-            placeholders = ", ".join(f"${p + i}" for i in range(len(entity_id)))
-            sql_conditions.append(f'"{entity_id_field}" IN ({placeholders})')
-            sql_params.extend(entity_id)
-            p += len(entity_id)
+            if entity_id:
+                placeholders = ", ".join(f"${p + i}" for i in range(len(entity_id)))
+                sql_conditions.append(f'"{entity_id_field}" IN ({placeholders})')
+                sql_params.extend(entity_id)
+                p += len(entity_id)
+            else:
+                sql_conditions.append("FALSE")
         else:
             sql_conditions.append(f'"{entity_id_field}" = ${p}')
             sql_params.append(entity_id)

tests/test_litellm/proxy/management_endpoints/test_common_daily_activity.py

@@ -14,6 +14,7 @@ sys.path.insert(0, os.path.abspath("../../../.."))  # Adds the parent directory
 from litellm.proxy.management_endpoints.common_daily_activity import (
     _adjust_dates_for_timezone,
     _build_aggregated_sql_query,
+    _build_entity_rollup_sql_query,
     _is_user_agent_tag,
     _record_to_spend_metrics,
     get_api_key_metadata,
@@ -982,6 +983,58 @@ class TestBuildAggregatedSqlQuery:
         assert "COALESCE(model_group, model)" not in normalized
 
 
+class TestAggregatedEmptyEntityFilter:
+    _BUILDERS: Final = (_build_aggregated_sql_query, _build_entity_rollup_sql_query)
+
+    @pytest.mark.parametrize("build", _BUILDERS)
+    def test_empty_entity_list_emits_no_degenerate_in_clause(self, build):
+        sql, params = build(
+            table_name="litellm_dailyteamspend",
+            entity_id_field="team_id",
+            entity_id=[],
+            start_date="2026-08-01",
+            end_date="2026-08-19",
+            model=None,
+            api_key=None,
+        )
+
+        normalized = " ".join(sql.split())
+        assert "IN ()" not in normalized
+        assert '"team_id" IN' not in normalized
+        assert params == ["2026-08-01", "2026-08-19"]
+
+    @pytest.mark.parametrize("build", _BUILDERS)
+    def test_empty_entity_list_matches_nothing_rather_than_everything(self, build):
+        sql, _ = build(
+            table_name="litellm_dailyteamspend",
+            entity_id_field="team_id",
+            entity_id=[],
+            start_date="2026-08-01",
+            end_date="2026-08-19",
+            model=None,
+            api_key=None,
+        )
+
+        assert "FALSE" in " ".join(sql.split())
+
+    @pytest.mark.parametrize("build", _BUILDERS)
+    def test_populated_entity_list_still_filters_on_its_ids(self, build):
+        sql, params = build(
+            table_name="litellm_dailyteamspend",
+            entity_id_field="team_id",
+            entity_id=["team-alpha", "team-beta"],
+            start_date="2026-08-01",
+            end_date="2026-08-19",
+            model=None,
+            api_key=None,
+        )
+
+        normalized = " ".join(sql.split())
+        assert '"team_id" IN ($3, $4)' in normalized
+        assert "FALSE" not in normalized
+        assert params == ["2026-08-01", "2026-08-19", "team-alpha", "team-beta"]
+
+
 @pytest.mark.asyncio
 async def test_get_daily_activity_aggregated_empty_result_set():
     """Regression test for the empty-range 500.